Sqlalchemy: avoiding multiple inheritance and having abstract base class

Question

So I have a bunch of tables using SQLAlchemy that are modelled as objects which inherit from the result to a call to declarative_base(). Ie:

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Answer 1

It is pretty straigh-forward, you just make declarative_base() to return a Base class which inherits from your CommonBase using cls= parameter. Also shown in Augmenting The Base docs. Your code might then look similar to below:

class CommonBase(object):
    @classmethod
    def somecommonaction(cls):
        # body here

Base = declarative_base(cls=CommonBase)

class Table1(Base):
    # __tablename__ & Table1 specific fields here

class Table2(Base):
     # __tablename__ & Table2 specific fields here